package com.crrcdt.vue_project.util;

/**
 * @author lj on 2020/10/5.
 * @version 1.0
 */

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;

/**
 * 生成验证码的工具类
 */
public class VerifyCode {

        private int width = 100;// 生成验证码图片的宽度
        private int height = 50;// 生成验证码图片的高度
        private String[] fontNames = { "宋体", "楷体", "隶书", "微软雅黑" };
        private Color bgColor = new Color(255, 255, 255);// 定义验证码图片的背景颜色为白色
        private Random random = new Random();
        private String codes = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
        private String text;// 记录随机字符串

/**
 * 获取一个随意颜色
 *
 * @return
 */
private Color randomColor() {
        int red = random.nextInt(150);
        int green = random.nextInt(150);
        int blue = random.nextInt(150);
        return new Color(red, green, blue);
        }

/**
 * 获取一个随机字体
 *
 * @return
 */
private Font randomFont() {
        String name = fontNames[random.nextInt(fontNames.length)];
        int style = random.nextInt(4);
        int size = random.nextInt(5) + 24;
        return new Font(name, style, size);
        }

/**
 * 获取一个随机字符
 *
 * @return
 */
private char randomChar() {
        return codes.charAt(random.nextInt(codes.length()));
        }

/**
 * 创建一个空白的BufferedImage对象
 *
 * @return
 */
private BufferedImage createImage() {
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics2D g2 = (Graphics2D) image.getGraphics();
        g2.setColor(bgColor);// 设置验证码图片的背景颜色
        g2.fillRect(0, 0, width, height);
        return image;
        }

public BufferedImage getImage() {
        BufferedImage image = createImage();
        Graphics2D g2 = (Graphics2D) image.getGraphics();
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < 4; i++) {
        String s = randomChar() + "";
        sb.append(s);
        g2.setColor(randomColor());
        g2.setFont(randomFont());
        float x = i * width * 1.0f / 4;
        g2.drawString(s, x, height - 15);
        }
        this.text = sb.toString();
        drawLine(image);
        return image;
        }

/**
 * 绘制干扰线
 *
 * @param image
 */
private void drawLine(BufferedImage image) {
        Graphics2D g2 = (Graphics2D) image.getGraphics();
        int num = 5;
        for (int i = 0; i < num; i++) {
        int x1 = random.nextInt(width);
        int y1 = random.nextInt(height);
        int x2 = random.nextInt(width);
        int y2 = random.nextInt(height);
        g2.setColor(randomColor());
        g2.setStroke(new BasicStroke(1.5f));
        g2.drawLine(x1, y1, x2, y2);
        }
        }

public String getText() {
        return text;
        }

public static void output(BufferedImage image, OutputStream out) throws IOException {
        ImageIO.write(image, "JPEG", out);
        }
        }
